Doc # INS-SFT-15003
Issue Date: 08/12/2016
Revision: B
Page 28 of 30
7.
Using the TWAIN Interface
If the Twain interface (SFT-10011) is installed, the camera can be used with any TWAIN Compliant
Application.
The TWAIN interface will attach itself to the first Videology camera it finds connected to the computer. For
best operation, run the TWAIN Interface on a system that has only one Videology camera installed.
Any application that supports a TWAIN Data Source as a capture device can access the camera. The
camera's image will appear as shown below:
7.1.
ZOOM FEATURE
The Optical zoom function is basically used to frame the subject within the field of view (FOV). The subject
may be of differing height, distance, or position within the FOV, and the optical zoom provides a means of
sizing and positioning the frame so as to provide an image of the correct proportions.
With no optical zoom capability within the camera, we need to provide some other means of framing the
image to the size and proportions required.
One option would be to provide real time digital zoom, but doing this within the live video stream is
problematic and would result in reduced frame rates, and somewhat jerky video.
An alternative approach is to provide a means of defining the size and position of the captured image
within the streaming video. This is somewhat analogous to aiming and zooming the camera with the
optical zoom.
7.2.
Mode of operation
7.2.1.
Preview mode
The streaming video is shown in 640 x 480 resolution.
